I'm slightly dubious. The holes for the cutters are important because they're designed so the rivets fail instead of the bar or the cutter when you hit a rock. It may well be my lack of imagination but I'm having a hard time seeing these mounted in a way that supports that.
Maybe hedge trimmer blades, they work in a similar fashion but are less prone to getting jammed into rocks? Hmm.. most of those are more saw toothy shaped though. I dunno..
No markings or letters on the packaging?
How big are they?